Method and apparatus for selecting multiple transport formats and transmitting multiple transport blocks simultaneously with multiple H-ARQ processes

ABSTRACT

A method and apparatus for selecting multiple transport formats and transmitting multiple transport blocks (TBs) in a transmission time interval simultaneously with multiple hybrid automatic repeat request (H-ARQ) processes in a wireless communication system are disclosed. Available physical resources and H-ARQ processes associated with the available physical resources are identified and channel quality of each of the available physical resources is determined. Quality of service (QoS) requirements of higher layer data to be transmitted are determined. The higher layer data is mapped to at least two H-ARQ processes. Physical transmission and H-ARQ configurations to support QoS requirements of the higher layer data mapped to each H-ARQ process are determined. TBs are generated from the mapped higher layer data in accordance with the physical transmission and H-ARQ configurations of each H-ARQ process, respectively. The TBs are transmitted via the H-ARQ processes simultaneously.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.13/872,564, filed on Apr. 29, 2013, which is a continuation of U.S.patent application Ser. No. 11/614,153 filed on Dec. 21, 2006, whichissued as U.S. Pat. No. 8,432,794 on Apr. 30, 2013, which claims thebenefit of U.S. provisional application Nos. 60/754,714 filed Dec. 29,2005 and 60/839,845 filed Aug. 24, 2006, which are incorporated byreference herein as if fully set forth herein.

FIELD OF INVENTION

The present invention is related to wireless communication systems. Moreparticularly, the present invention is related to a method and apparatusfor selecting multiple transport formats and transmitting multipletransport blocks (TBs) in a transmission time interval (TTI)simultaneously with multiple hybrid automatic repeat request (H-ARQ)processes in a wireless communication system.

BACKGROUND

The objective of evolved high speed packet access (HSPA+) and long termevolution (LTE) of universal terrestrial radio access (UTRA) anduniversal terrestrial radio access network (UTRAN) is to develop a radioaccess network for high data rate, low latency, packet optimization, andimproved system capacity and coverage. In order to achieve these goals,an evolution of a radio interface and radio network architecture arebeing considered. In HSPA+, the air interface technology will still bebased on code division multiple access (CDMA) but with more efficientphysical layer architecture which may include independent channelizationcodes, (distinguished with regard to channel quality), andmultiple-input multiple-output (MIMO). In LTE, orthogonal frequencydivision multiple access (OFDMA) and frequency division multiple access(FDMA) are proposed as the air interface technologies to be used in thedownlink and the uplink, respectively.

H-ARQ has been adopted by several wireless communication standards,including third generation partnership project (3GPP) and 3GPP2. Besidesradio link control (RLC) layer automatic repeat request (ARQ) function,H-ARQ improves throughput, compensates for link adaptation errors andprovides efficient transmission rates through the channel. The delaycaused by H-ARQ feedback, (i.e., a positive acknowledgement (ACK) or anegative acknowledgement (NACK)), is significantly reduced by placingthe H-ARQ functionality in a Node-B rather than in a radio networkcontroller (RNC). A user equipment (UE) receiver may combine soft bitsof the original transmission with soft bits of subsequentretransmissions to achieve higher block error rate (BLER) performance.Chase combining or incremental redundancy may be implemented.

Asynchronous H-ARQ is used in high speed downlink packet access (HSDPA)and synchronous H-ARQ is used in high speed uplink packet access(HSUPA). In both HSDPA and HSUPA, radio resources allocated for thetransmission are the number of codes at a certain frequency band basedon one channel quality indication (CQI) feedback. There is nodifferentiation among channelization codes. Therefore, one HSDPA mediumaccess control (MAC-hs) flow or one HSUPA medium access control(MAC-e/es) flow multiplexed from multiple dedicated channel MAC (MAC-d)flows is assigned to one H-ARQ process and one cyclic redundancy check(CRC) is attached to one transport block.

A new physical layer attribute introduced in HSPA+ includes MIMO anddifferent channelization codes. New physical layer attributes introducedin LTE include MIMO and different subcarriers, (localized ordistributed). With introduction of these new physical layer attributes,the performance of conventional single H-ARQ scheme and transport formatcombination (TFC) selection procedure should be changed. In aconventional single H-ARQ scheme, only one H-ARQ process is active at atime and a TFC of only one transport data block needs to be determinedin each TTI. The conventional TFC selection procedure does not have theability to make TFC selection for more than one data block for multipleH-ARQ processes.

SUMMARY

The present invention is related to a method and apparatus for selectingmultiple transport formats and transmitting multiple TBs in a TTIsimultaneously with multiple H-ARQ processes in a wireless communicationsystem. Available physical resources and the channel quality of each ofthe available physical resources are determined, and the H-ARQ processesassociated with the available physical resources are identified. Qualityof service (QoS) requirements of higher layer data flow(s) to betransmitted are determined. The higher layer data flow(s) is mapped toat least two H-ARQ processes. Physical transmission parameters and H-ARQconfigurations to support QoS requirements of the higher layer dataflow(s) mapped to each H-ARQ process are determined. TBs are generatedfrom the mapped higher layer data flow(s) in accordance with thephysical transmission parameters and H-ARQ configurations of each H-ARQprocess, respectively. The TBs are transmitted via the H-ARQ processessimultaneously.

BRIEF DESCRIPTION OF THE DRAWINGS

A more detailed understanding of the invention may be had from thefollowing description of a preferred embodiment, given by way of exampleand to be understood in conjunction with the accompanying drawingswherein:

FIG. 1 is a block diagram of an apparatus configured in accordance withthe present invention; and

FIG. 2 is a flow diagram of a process for transmitting multiple TBs in aTTI simultaneously with multiple H-ARQ processes in accordance with thepresent invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

When referred to hereafter, the terminology “wireless transmit/receiveunit” (WTRU) includes but is not limited to a user equipment (UE), amobile station, a fixed or mobile subscriber unit, a pager, a cellulartelephone, a personal digital assistant (PDA), a computer, or any othertype of user device capable of operating in a wireless environment. Whenreferred to hereafter, the terminology “base station” includes but isnot limited to a Node-B, an evolved Node-B (eNB), a site controller, anaccess point (AP), or any other type of interfacing device capable ofoperating in a wireless environment.

The present invention is applicable to any wireless communication systemincluding, but not limited to, wideband code division multiple access(WCDMA), CDMA2000, HSPA+, LTE of 3GPP systems, OFDM, MIMO or OFDM/MIMO.

The features of the present invention may be incorporated into anintegrated circuit (IC) or be configured in a circuit comprising amultitude of interconnecting components.

Different antenna spatial beams or channelization codes may experience adifferent channel quality, which may be indicated by CQI feedback. Thesame adaptive modulation and coding (AMC) may be applied to all thesubcarriers, spatial beams or channelization codes which are independentof the quality of the subcarriers, spatial beams and channelizationcodes. Alternatively, the channel condition may be used to applydifferent AMC to different subcarriers, spatial beams or channelizationcodes in order to maximize the performance.

When subcarrier, spatial beam or channelization code-dependent AMC isused, each data block that is assigned to each subcarrier, spatial beamor channelization code is associated with one CRC in accordance with thepresent invention. Otherwise, upon transmission error, the entire packetdistributed to different subcarriers, spatial beams or channelizationcodes need to be retransmitted because the whole packet is associatedwith a single CRC. Retransmitting every data block that has already beencorrectly received will waste the valuable radio resources. The samesituation applies when MIMO is used because each antenna may be subjectto different channel conditions. Thus, when multi-dimensional H-ARQprocesses are used with each H-ARQ process corresponding to one or moresubcarriers, channelization codes, transmit antennas (or spatial beams),a separate CRC is attached to each transport data block in accordancewith the present invention. In a conventional single H-ARQ scheme, onlyone H-ARQ process is active at a time and a TFC of only one transportdata block needs to be determined in each TTI. The conventional TFCselection procedure does not have the ability to make TFC selection formore than one data block for multiple H-ARQ processes to properlysupport QoS requirements of higher layer data flows.

FIG. 1 is a block diagram of an apparatus 100 for transmitting multipletransport blocks (TBs) simultaneously in a transmission time interval(TTI) with multiple H-ARQ processes in accordance with the presentinvention. The apparatus 100 may be a WTRU, a Node-B, or any othercommunication device. The apparatus 100 includes a plurality of H-ARQprocesses 102 a-102 n, a plurality of multiplexing and link adaptationprocessors 104 a-104 n and a controller 106. Each multiplexing and linkadaptation processor 104 a-104 n is associated with one H-ARQ process102 a-102 n. Each multiplexing and link adaptation processor 104 a-104 nreceives physical resource configuration, (i.e., sub-carriersdistributed or localized, MIMO antenna configurations, or the like), andCQIs associated with these physical resources.

Each available H-ARQ process 102 a-102 n is associated with a specificset of physical resources. The association of physical resources to theH-ARQ processes 102 a-102 n may be determined dynamically, or theassociation may be semi-statically configured. A network entity, (e.g.,an eNB scheduler), determines how many physical resources should beassigned. Physical resources associated with a particular H-ARQ processmay be dynamically reassigned each time a TFC is selected by themultiplexing and link adaptation processor 104 a-104 n or each time theH-ARQ processor 102 a-102 n generates an H-ARQ retransmission for aparticular TB. The reassignment of physical resources may be performedbased on the CQI of particular physical resources or determined based ona predefined hopping pattern.

The multiplexing and link adaptation processors 104 a-104 n perform linkadaptation independently for each set of physical resources andassociated H-ARQ processes 102 a-102 n. Each multiplexing and linkadaptation processor 104 a-104 n determines a modulation and codingscheme (MCS), a multiplexed TB, transmit power requirement, an H-ARQredundancy version and maximum number of retransmissions each TTI. Thisset of transmission information is provided to each H-ARQ process 102a-102 n.

The physical resources may be defined by independent spatial streams (ifMIMO is implemented) in the space domain, independent subcarriers (ifOFDMA or FDMA is implemented) in the frequency domain, independentchannelization codes (if CDMA is implemented) in the code domain,independent timeslots in the time domain, or any combination thereof.The independent subcarriers may be distributed or localized. Thechannelization codes are physical resources that can be assigned todifferent TBs independently. In CDMA systems, different channelizationcodes may be assigned to transmit one TB, or several TBs based on thechannel condition and data rate requirement for each TB. The maximumnumber of TBs that can be transmitted is less or equal to the maximumnumber of channelization codes available. When several independentspatial streams, subcarriers or channelization codes are available,several TBs may be transmitted simultaneously via different physicalresources with several H-ARQ processes. For example, if two spatialstreams are available in a 2×2 MIMO system, two TBs may be transmittedsimultaneously via two spatial streams with two independent H-ARQprocesses.

Different physical resources, (i.e., different subcarriers, antennaspatial beams, channelization codes or timeslots), may experiencedifferent channel quality. The quality of each physical resource isdetermined by one or more CQI measurements. The CQI may be fed back froma communication peer or may be obtained based on channel reciprocity.The CQI may also be represented by an allowed MCS and/or maximumtransport block size.

The controller 106 identifies available physical resources and H-ARQprocesses associated with the available physical resources. Since eachH-ARQ process 102 a-102 n is associated with a particular physicalresource, when available physical resources are identified, availableH-ARQ processes are also identified. The available physical resourcesand associated H-ARQ processes may be determined at the start of acommon TTI boundary. The association may also be semi-staticallyconfigured over a period of multiple TTIs.

The available physical resources are the number of independent spatialstreams, subcarriers, channelization codes and timeslots that can beused for data transmission within a certain period. The availablephysical resources for one WTRU are dependent on many factors such asnumber of WTRUs that a Node-B needs to support in one cell, theinterference level from other cells, the channel condition of the WTRU,the QoS levels (such as priorities, latency, fairness and buffer status)of the services the WTRU needs to support, the data rates one WTRU needsto support, or the like.

In accordance with the present invention, multiple H-ARQ processes 102a-102 n operate simultaneously and in parallel. Since H-ARQ processes102 a-102 n may take a different number of retransmissions forsuccessful transmission and since the data flows mapped to the H-ARQprocesses 102 a-102 n may have QoS requirements that determine adifferent maximum number of retransmissions or different TTI sizes, acertain H-ARQ may not be available if H-ARQ processes are notsynchronized with each other. Any number of H-ARQ processes may becomeavailable in any TTI. In accordance with the present invention, morethan one H-ARQ process and associated set of physical resources becomeavailable in a common TTI. The association between H-ARQ processes andphysical resources is coordinated by the controller 106.

The controller 106 maps higher layer data flows 108 a-108 m, (i.e.,multiple flows of MAC or RLC protocol data units (PDUs)), to at leasttwo multiplexing and link adaptation processors 104 a-104 n and theirassociated H-ARQ processes 102 a-102 n. The same higher layer data flow108 a-108 m may be mapped to more than one multiplexing and linkadaptation processor 104 a-104 n and H-ARQ process 102 a-102 n in acommon TTI for QoS normalization. By mapping the same higher layer dataflow or set of higher layer data flows to multiple H-ARQ processes, QoSrequirement across the H-ARQ process 102 a-102 n is common. In thiscase, each multiplexing and link adaptation processor 104 a-104 ndetermines an MCS, a transport block size, a transmit power, maximumH-ARQ transmissions and transmission parameters in accordance with theCQIs of the set of associated physical resources so that the QoSachieved for each transmission of the higher layer data flow or set ofdata flows is as similar as possible.

Alternatively, unequal error protection may also be achieved by mappingthe higher layer data flows 108 a-108 m, that may be grouped inaccordance with QoS requirements to different H-ARQ processes 102 a-102n based on the data flow QoS requirements and CQIs associated with theset of physical resources assigned to each H-ARQ process. For example,CQIs may show that one set of physical resources is better than othersets of physical resources. A higher layer data flow with higher QoSrequirements may be mapped to an H-ARQ process associated with betterphysical resources. The number of higher layer data flows that will bemapped to a specific H-ARQ process is determined based on the QoSrequirements of the higher layer data flows, packet size, H-ARQcapacity, or the like. Once the respective higher layer data flows to betransmitted using specific H-ARQ processes are decided, those data flowsare multiplexed through the multiplexing and link adaptation processors104 a-104 n for different H-ARQ processes.

Each multiplexing and link adaptation processor 104 a-104 n receives aninput, (such as, CQIs of the assigned physical resources, bufferoccupancy of the mapped data flows, or the like), and determinesphysical transmission parameters and H-ARQ configurations to support QoSrequirements of the higher layer data flows 108 a-108 m mapped to eachH-ARQ process. The physical transmission parameters include atransmission power, a modulation and coding scheme, a TTI size, atransport block size and a beamforming pattern, the subcarrierallocation, MIMO antenna configuration or the like. The H-ARQconfiguration parameters include an H-ARQ identity, a maximum number ofretransmissions, a redundancy version (RV), a CRC size, or the like. Themultiplexing and link adaptation processor 104 a-104 n provides theH-ARQ parameters to the associated H-ARQ process 102 a-102 n.

The multiplexing and link adaptation processor 104 a-104 n may apply thesame MCS, transport block size, TTI size and/or transmit power to allphysical resources which are independent of the quality of the physicalresources. Alternatively, the multiplexing and link adaptation processor104 a-104 n may apply different MCS, transport block size, TTI sizeand/or transmit power to different physical resources based on channelcondition in order to maximize the performance.

When physical resource-dependent AMC and H-ARQ operation is used, eachdata block that is assigned to each physical resource is preferablyassociated with a separate CRC. With this scheme, the entire packetdistributed to different physical resources does not need to beretransmitted upon a transmission error because each transport block isassociated with a separate CRC and is processed by a separate H-ARQprocess 102 a-102 n.

The multiplexing and link adaptation processors 104 a-104 n thengenerate TBs from the assigned higher layer data flows 108 a-108 m afterselecting a proper TFC, (i.e., TB size, TB set size, TTI size,modulation and coding scheme (MCS), transmission power, antenna beams,the subcarrier allocation, CRC size, redundancy version (RV) and datablock to radio resource mapping, or the like), for the TB based onchannel quality indicators and the physical transmission parameters. Oneor more higher layer data flows may be multiplexed into one TB. Aseparate CRC is attached to each of the TBs for separate error detectionand H-ARQ processing. Each TB and associated transmission parameters areprovided to the assigned H-ARQ process 102 a-102 n. The TBs are thentransmitted via the assigned H-ARQ processes 102 a-102 n, respectively.

The parameters supporting multiple H-ARQ processes may be signaled to areceiving peer before transmission or a blind detection technique may beused at the receiving peer to decode the transmission parameters. Thegenerated TBs along with the associated transmission parameters are sentto the H-ARQ processes 102 a-102 n for transmission.

FIG. 2 is a flow diagram of a process 200 for transmitting multiple TBsin a TTI simultaneously with multiple H-ARQ processes in accordance withthe present invention. Available physical resources and their channelquality associated with each H-ARQ process 102 a-102 n are identified(step 202). QoS requirements and buffer occupancy of higher layer dataflows 108 a-108 m to be transmitted are determined (step 204). It shouldbe noted that the steps in the process 200 may be performed in differentorder and some steps may be performed in parallel. For example, the step204 may be applied before the step 202, or simultaneously.

The controller 106 may determine the type of higher layer data flows 108a-108 m for TFC selection processing based on QoS parameters associatedwith those higher layer data flows. The controller 106 may alsodetermine the order in which the higher layer data flows are serviced.The order of processing may be determined by QoS requirements orabsolute priority. Alternatively, a life span time parameter may be usedin determining the duration that the higher layer data packets may stayin an H-ARQ queue so that the controller 106 may prioritize or discardhigher layer data packets based on the life span time parameter.

The higher layer data flows 108 a-108 m are mapped to the respectiveH-ARQ processes 102 a-102 n by the controller 106. Physical transmissionparameters and H-ARQ configurations are determined for each of theavailable H-ARQ processes 102 a-102 n to support the required QoS of thehigher layer data flows 108 a-108 m mapped to each of the H-ARQprocesses 102 a-102 n (step 206). When more than one H-ARQ process isavailable for transmission in a TTI, it is necessary to determine whichhigher layer data flows 108 a-108 m should be mapped to different H-ARQprocesses. The higher layer data flows 108 a-108 m may or may not havesimilar QoS requirements.

When all or a subset of higher layer data flows 108 a-108 m to be mappedto different HARQ processes require similar QoS, then the QoS providedby the H-ARQ processes 102 a-102 n is normalized, (i.e., transmissionparameters, (such as, MCS, TB size and transmission power), and H-ARQconfigurations are adjusted each TTI a TFC is selected such that the QoSprovided across the H-ARQ processes 102 a-102 n is similar). The QoSnormalization across multiple H-ARQ processes 102 a-102 n may berealized by adjusting the link adaptation parameters (e.g., MCS, TBsize, transmission power, or the like) across the H-ARQ processes 102a-102 n. For example, a higher MCS may be assigned to the physicalresources that have better channel quality and a lower MCS may beassigned to the physical resources that have worse channel quality. Thismay result in different sizes of the multiplexed data block fordifferent H-ARQ processes.

Alternatively, when the higher layer data flows 108 a-108 m requiredifferent QoSs, the higher layer data flows 108 a-108 m may be mapped toH-ARQ processes 102 a-102 n associated with physical resources withquality that closely matches the QoS requirements of the higher layerdata flows 108 a-108 m. An advantage of using multiple H-ARQ processesis its flexibility to multiplex logical channels or MAC flows withdifferent QoS requirements to different H-ARQ processes 102 a-102 n andassociated physical resources. When a certain physical resourceindicates a better channel quality than others, data with a higher QoSis mapped to the H-ARQ process associated with that physical resource.This enhances physical resource utilization and maximizes systemthroughput. Alternatively, or additionally, an MCS and/or the maximumnumber of retransmissions may be configured to differentiate the QoS tomore closely match the logical channel or MAC flow's QoS requirements.

After the higher layer data flows 108 a-108 m are mapped to the H-ARQprocesses 102 a-102 n, a TB for each H-ARQ process 102 a-102 n isgenerated in accordance with the physical transmission parameters andH-ARQ configurations for each H-ARQ process 102 a-102 n, respectively,by multiplexing the higher layer data flows 108 a-108 m associated witheach H-ARQ process 102 a-102 n (step 208). Data multiplexing for eachH-ARQ process 102 a-102 n may be processed sequentially or in parallel.The TBs are then transmitted simultaneously via the associated H-ARQprocesses 102 a-102 n (step 210).

The transmitted TBs may or may not be successfully received at thecommunication peer. A failed TB is retransmitted in a subsequent TTI.Preferably, the size of the retransmitted TB remains the same for softcombing at the communication peer. Several options are possible forretransmission of the failed TB.

In accordance with the first option, the physical resources allocatedfor H-ARQ retransmission of the TB remain unchanged, (i.e., the failedTB is retransmitted via the same physical resources and H-ARQ process.The transmission parameters and H-ARQ configurations, (i.e., a TFC), maybe changed. Specifically, the link adaptation parameters, (such asantenna selection, AMC or transmit power), may be changed to maximizethe chance of successful delivery of the retransmitted TB. When the linkadaptation parameters are changed for retransmission of the failed TB,the changed parameters may be signaled to the receiving peer.Alternatively, a blind detection technique may be applied at thereceiving peer to eliminate the signaling overhead for changedparameters.

In accordance with the second option, physical resources allocated forH-ARQ retransmission of the transport block may be dynamicallyreassigned, (i.e., the failed TB is retransmitted on different physicalresources and the same H-ARQ process). The reassignment of physicalresources may be based on CQI or based on a known hopping pattern.

In another option, a failed H-ARQ transmission may be fragmented acrossmultiple H-ARQ processes and each fragment transmitted independently toincrease the probability of successful H-ARQ transmission. In accordancewith this option, the physical resources for the retransmitted TB arenewly allocated, (i.e., the failed TB is transmitted via a differentH-ARQ process). The H-ARQ process used to transmit the failed TB in theprevious TTI becomes available for transmission of any other TB in thesubsequent TTI. The maximum transmit power, the number of subcarriers orchannelization codes, the number or allocation of antennas andrecommended MCS may be re-allocated for retransmission of the failed TB.Preferably, a new allowed TFCS subset may be generated to reflect thephysical resource change for the failed TB. The new parameters may besignaled to the receiving peer to guarantee successful reception.Alternatively, a blind detection technique may be applied at thereceiving peer to eliminate the signaling overhead for changedparameters.

Although the features and elements of the present invention aredescribed in the preferred embodiments in particular combinations, eachfeature or element can be used alone without the other features andelements of the preferred embodiments or in various combinations with orwithout other features and elements of the present invention. Themethods or flow charts provided in the present invention may beimplemented in a computer program, software, or firmware tangiblyembodied in a computer-readable storage medium for execution by ageneral purpose computer or a processor. Examples of computer-readablestorage mediums include a read only memory (ROM), a random access memory(RAM), a register, cache memory, semiconductor memory devices, magneticmedia such as internal hard disks and removable disks, magneto-opticalmedia, and optical media such as CD-ROM disks, and digital versatiledisks (DVDs).

Suitable processors include, by way of example, a general purposeprocessor, a special purpose processor, a conventional processor, adigital signal processor (DSP), a plurality of microprocessors, one ormore microprocessors in association with a DSP core, a controller, amicrocontroller, Application Specific Integrated Circuits (ASICs), FieldProgrammable Gate Arrays (FPGAs) circuits, any other type of integratedcircuit (IC), and/or a state machine.

A processor in association with software may be used to implement aradio frequency transceiver for use in a wireless transmit receive unit(WTRU), user equipment (UE), terminal, base station, radio networkcontroller (RNC), or any host computer. The WTRU may be used inconjunction with modules, implemented in hardware and/or software, suchas a camera, a video camera module, a videophone, a speakerphone, avibration device, a speaker, a microphone, a television transceiver, ahands free headset, a keyboard, a Bluetooth® module, a frequencymodulated (FM) radio unit, a liquid crystal display (LCD) display unit,an organic light-emitting diode (OLED) display unit, a digital musicplayer, a media player, a video game player module, an Internet browser,and/or any wireless local area network (WLAN) module.

What is claimed is:
 1. A wireless transmit/receive unit (WTRU)configured to receive a plurality of transport blocks (TBs) in atransmission time interval (TTI), the WTRU comprising: a transmitterconfigured to send a channel quality indicator (CQI) feedback messageincluding a CQI for each of a plurality of sets of sub-carriers; areceiver configured to receive an allocation of radio resources thatincludes at least two sets of physical resources, wherein the allocationis based on the CQI feedback message; the receiver further configured toreceive the plurality of TBs in the TTI using the at least two sets ofphysical resources, wherein each set of the at least two sets ofphysical resources has associated hybrid automatic repeat request(H-ARQ) process information, a modulation and coding scheme (MCS), atransport block size, and a redundancy version; the transmitter furtherconfigured to transmit an indication that an at least one TB of theplurality of TBs was not received; and the receiver further configuredto receive a retransmission of the at least one TB.
 2. The WTRU of claim1 wherein each CQI represents an MCS.
 3. The WTRU of claim 1 whereineach set of the at least two sets of physical resources is for adifferent MIMO stream.
 4. The WTRU of claim 3 wherein each MIMO streamis a spatial stream.
 5. The WTRU of claim 1 wherein each set of the atleast two sets of physical resources is for a different set ofsub-carriers.
 6. The WTRU of claim 1 wherein each TB of the plurality ofTBs has an associated cyclic redundancy check (CRC).
 7. A method forreceiving a plurality of transport blocks (TBs) in a transmission timeinterval (TTI), the method comprising: sending a channel qualityindicator (CQI) feedback message including a CQI for each of a pluralityof sets of sub-carriers; receiving an allocation of radio resources thatincludes at least two sets of physical resources, wherein the allocationis based on the CQI feedback message; receiving the plurality of TBs inthe TTI using the at least two sets of physical resources, wherein eachset of the at least two sets of physical resources has associated hybridautomatic repeat request (H-ARQ) process information, a modulation andcoding scheme (MCS), a transport block size, and a redundancy version;transmitting an indication that an at least one TB of the plurality ofTBs was not received; and receiving a retransmission of the at least oneTB.
 8. The method of claim 7 wherein each CQI represents an MCS.
 9. Themethod of claim 7 wherein each set of the at least two sets of physicalresources is for a different MIMO stream.
 10. The method of claim 9wherein each MIMO stream is a spatial stream.
 11. The method of claim 7wherein each set of the at least two sets of physical resources is for adifferent set of sub-carriers.
 12. The method of claim 7 wherein each TBof the plurality of TBs has an associated cyclic redundancy check (CRC).13. An evolved NodeB (eNB) comprising: a receiver configured to receivea channel quality indicator (CQI) feedback message including a CQI foreach of a plurality of sets of sub-carriers; a transmitter configured totransmit an allocation of radio resources that includes at least twosets of physical resources, wherein the allocation is based on the CQIfeedback message; the transmitter further configured to transmit aplurality of transport blocks (TBs) in a transmission time interval(TTI) using the at least two sets of physical resources, wherein eachset of the at least two sets of physical resources has associated hybridautomatic repeat request (H-ARQ) process information, a modulation andcoding scheme (MCS), a transport block size, and a redundancy version;the receiver further configured to receive an indication that an atleast one TB of the plurality of TBs was not received; and thetransmitter further configured to transmit the at least one TB.
 14. TheeNB of claim 13 wherein each CQI represents an allowed MCS.
 15. The eNBof claim 13 wherein each set of the at least two sets of physicalresources is for a different MIMO stream.
 16. The eNB of claim 15wherein each MIMO stream is a spatial stream.
 17. The eNB of claim 13wherein each set of the at least two sets of physical resources is for adifferent set of sub-carriers.
 18. The eNB of claim 13 wherein each TBof the plurality of TBs has an associated cyclic redundancy check (CRC).